TCU Horned Frogs quarterback Casey Pachall (4) is angry at one of his receivers after a miscue caused him to call a time out in the fourth quarter as Texas Christian University plays Southern Methodist University in Dallas, Texas, September 29, 2012. Pachall was arrested on suspicion of DWI early Thursday, October 4, 2012. (Rodger Mallison/Fort Worth Star-Telegram/MCT)

TCU quarterback Casey Pachall (4) throws during the first half of an NCAA college football game against Grambling State in Fort Worth, Texas, Saturday, Sept. 8, 2012. (AP Photo/LM Otero)

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TCU quarterback Casey Pachall (4) celebrates a touchdown during the first half of an NCAA college football game against Grambling State in Fort Worth, Texas, Saturday, Sept. 8, 2012. (AP Photo/LM Otero)

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TCU quarterback Casey Pachall (4) dives against Grambling State defensive backs De'Vontay Hogan (10) and Tyler Smith (47) during the first half of an NCAA college football game in Fort Worth, Texas, Saturday, Sept. 8, 2012. (AP Photo/LM Otero)

Texas Christian quarterback Casey Pachall (4) celebrates a 1-yard TD run by running back Waymon James during the first quarter against Grambling State at Amon G. Carter Stadium in Fort Worth, Texas, on Saturday, September 8, 2012. (Max Faulkner/Fort Worth Star-Telegram/MCT)

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TCU quarterback Casey Pachall answers questions from the media at NCAA college football Big 12 Media Days, Monday, July 23, 2012, in Dallas.

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TCU quarterback Casey Pachall scrambles for a first down against Louisiana Tech as he follows fullback Luke Shivers during the first half of the Poinsettia Bowl NCAA college football game Wednesday, Dec. 21, 2011, in San Diego.

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TCU's Casey Pachall (4) rushes for a two point conversion against Boise State's Tyrone Crawford during the second half of an NCAA college football game on Saturday, Nov. 12, 2011 in Boise, Idaho. TCU went on to upset BSU 36-35.(AP Photo/The Idaho Statesman, Joe Jaszewski) MANDATORY CREDIT

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TCU quarterback Casey Pachall (4) passes against BYU linebacker Jameson Frazier (48) during the first half of an NCAA college football game at Cowboys Stadium Friday, Oct. 28, 2011, in Arlington, Texas.

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ARLINGTON, TX - OCTOBER 28: Casey Pachall #4 of the TCU Horned Frogs runs during a game against the BYU Cougars at Cowboys Stadium on October 28, 2011 in Arlington, Texas. The TCU Horned Frogs defeated the BYU Cougars 38-28.

“Casey Pachall has been suspended indefinitely from competition,” Patterson said in the statement. “My job as a head coach is to win games, educate our kids and help them with their lives.”

TCU officials declined additional comment and there was no media availability Thursday for anyone connected with the school's football program.

Pachall was booked into the Fort Worth jail after his arrest and was transferred at 4 a.m. to the Mansfield jail before he was released Thursday afternoon after posting a $1,000 bond.

It is the second incident in less than a year where substance abuse has been a problem for Pachall.

In August, Pachall apologized after a Fort Worth police report revealed that he had admitted to failing a drug test in February.

“I truly do apologize for what's been said and done on my behalf lately, and in the past as well,” Pachall said at a news conference before the season. “I've made mistakes. I know I'm not perfect.

“But I've learned from those mistakes and I'm still learning. It's a day-to-day process for me trying to be a better person and trying to be a better role model and leader for this team and this community and this university.”

At the time, Patterson said Pachall went through a mandatory university drug and alcohol awareness program that is required of first-time offenders “to be on this campus.”

Pachall was not punished for his earlier transgression and received no reprimand from the team for failing the drug test.

Pachall has started all four games this season for the No. 15 Horned Frogs, who will face Iowa State on Saturday night.

The former Brownwood High standout ranks fifth nationally in pass efficiency, throwing for 948 yards and 10 touchdowns with one interception.

If he is out of the lineup, he would likely be replaced by redshirt freshman Trevone Boykin. In limited playing time for the Horned Frogs this season, Boykin has completed 9 of 10 passes for 74 yards and rushed for 122 yards.